how about defining normal as "what humanity ate when it was developing"? Even just to say whole plants and animals, in about the proportions that they were nat

how about defining normal as "what humanity ate when it was developing"? Even just to say whole plants and animals, in about the proportions that they were naturally available about 40000 years ago. There's no reason to expect this to give you increased longevity though, dying was adaptive to early humans.